From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Ignition and dynamo issues on a 4-Goshawk II, with proposed solutions and tests.
| Identifier | ExFiles\Box 51\1\ Scan143 | |
| Date | 7th March 1923 | |
| X 4383 To EFC. {E. Fowler Clarke - Electrical Engineer} from R. {Sir Henry Royce} c. to CJ. BJ. Wor. {Arthur Wormald - General Works Manager} c. to Rg. {Mr Rowledge} Hs. {Lord Ernest Hives - Chair} EP. {G. Eric Platford - Chief Quality Engineer} c. to Ey. E. {Mr Elliott - Chief Engineer} Da. {Bernard Day - Chassis Design} Hy. {Tom Haldenby - Plant Engineer} R1/M7.3.23. RE 4-GOSHAWK II. The electrical equipment has been a disappointment (1) X.3485. The ignition make and break was found to have a loose contact. I understand these are now hard soldered. What is competitive practice ? I suggest we try:- PLATINUM increased area, thin washer (dished) of spring steel, small box nut, carefully screwed up and locked by gently riveting, (after dressing off nearly level). This practice allows replacing without damage to arm as the nut can be split or filed off. (2) DYNAMO. X.4383. X.4333. A main brush was found badly worn away and refusing to charge. I do not think this was mechanical wear, but sparking through the main brushes being out of position relative to the winding. Test the result of mechanical wear only, and also with current being generated. The speed on this car would be about 3000 dynamo revs. average say from 2000 to 4000. Test at these 3 speeds, find also result if main brushes are given a lead in direction of rotation as 2 pole machine. ARMATURE By shortening this connection relatively. One main brush has to carry exciting and output current, the other output only. Do they wear or spark unequally Other people use a softer brush which may spark or wear less. Do you want more angular embrace ? Would it be possible to have 50% to 100% more sections in commutator ? R. {Sir Henry Royce} | ||